摘要目的 研究不同噪声强度下的累积噪声暴露量(cumulative noise exposure,CNE)与听力损伤的关系.方法 根据ISO 1999提供的数据,采用统计的方法用三维曲面描述听力损伤百分率与CNE的相关性.结果 听力损伤不是一元(累积噪声暴露量)函数,而是二元(噪声暴露强度、噪声暴露年限)函数;不同噪声暴露强度下听力损伤出现拐点规律.在不同的噪声暴露强度下,当CNE近似等于噪声暴露强度+7 dBA时,听力损伤变化均出现拐点;当CNE小于拐点值时,听力损伤随累积暴露量增加变化缓慢;反之,变化急剧加大.结论 拐点规律表明,在噪声岗位工作时,一旦发现有听力损伤,可能会加剧,甚至导致听力难以恢复.

abstractsObjective To investigate the relationship between cumulative noise exposure (CNE) level and hearing loss induced by occupational noise.Methods In accordance with the data from ISO R1999,the relationship between hearing loss percentage and CNE was studied with statistical description method and three dimension curve graph.Results Hearing loss was not just a one-dimensional function CNE,but a twodimensional function of CNE (the intensity of noise exposure and the duration of noise exposure).Hearing loss curves presented flections at different intensities of noise exposure.When CNE hearing loss was approximately equal to the sum of noise exposure intensity and 7 dBA,hearing loss curves all presented flections.Hearing loss developed with the cumulated noise exposure level.When CNE was lower than the values of reflections,hearing loss worsened gradually and slowly with the intensity of cumulated noise exposure.Conversely,the opposite could be sighted in hearing loss.Conclusions The flexion pattern indicated that the hearing of those individuals could be worsened and even failed to recover permanently,once they were detected to have hearing loss induced by occupational noise exposure.